Question

java please. 

A palindrome is a word or a phrase that is the same when read both forward and backward. Examples are: "bob," "sees," or "never odd or even" (ignoring spaces). Write a program whose input is a word or phrase, and that outputs whether the input is a palindrome.

Ex: If the input is:

bob

the output is:

bob is a palindrome

Ex: If the input is:

bobby

the output is:

bobby is not a palindrome

Hint: Start by removing spaces. Then check if a string is equivalent to it's reverse.

Hint: Start by just handling single-word input, and submit for grading. Once passing single-word test cases, extend the program to handle phrases. If the input is a phrase, remove or ignore spaces.

Answer 1

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Happy HomeworkLibing

LabProgram1.java

public class LabProgram1 {
    public static void main(String[] args) {
        print_palindrome_or_not("bob");
        print_palindrome_or_not("bobby");
        print_palindrome_or_not("sees");
        print_palindrome_or_not("never odd or even");
    }

    public static void print_palindrome_or_not(String line) {
        if (isPalindrome(line)) {
            System.out.println(line + " is a palindrome");
        } else {
            System.out.println(line + " is not a palindrome");
        }
    }

    public static boolean isPalindrome(String line) {
        int i=0;
        int j = line.length()-1;
        while (i < j) {
            if (line.charAt(i) == line.charAt(j)) {
                ++i;
                --j;
            } else if (line.charAt(i) == ' ') {
                ++i;
            } else if (line.charAt(j) == ' ') {
                --j;
            } else {
                return false;
            }
        }
        return true;
    }
}

OUTPUT

(base) avianjjai@avianjjai-Vostro-3578:~/Desktop/Chegg$ java LabProgram1.java
bob is a palindrome
bobby is not a palindrome
sees is a palindrome
never odd or even is a palindrome
(base) avianjjai@avianjjai-Vostro-3578:~/Desktop/Chegg$ 

LabProgram1.js

function isPalindrome(line) {
    var i=0;
    var j = line.length-1;
    while (i < j) {
        if (line.charAt(i) == line.charAt(j)) {
            ++i;
            --j;
        } else if (line.charAt(i) == ' ') {
            ++i;
        } else if (line.charAt(j) == ' ') {
            --j;
        } else {
            return false;
        }
    }
    return true;
}

function print_palindrome_or_not(line) {
    if (isPalindrome(line)) {
        console.log(line + " is a palindrome");
    } else {
        console.log(line + " is not a palindrome");
    }
}

print_palindrome_or_not('bob');
print_palindrome_or_not('bobby');
print_palindrome_or_not('sees');
print_palindrome_or_not('never odd or even');

OUTPUT

(base) avianjjai@avianjjai-Vostro-3578:~/Desktop/Chegg$ node LabProgram1.js
bob is a palindrome
bobby is not a palindrome
sees is a palindrome
never odd or even is a palindrome
(base) avianjjai@avianjjai-Vostro-3578:~/Desktop/Chegg$